Performance characteristics of materials Performance characteristics of papers and boards - Performance characteristics of woods — AQA A-Level Design and Technology: Product Design
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Performance characteristics of materials Performance characteristics of papers and boards - Performance characteristics of woods explained
Planed square edge (PSE) describes timber that has been planed on all four surfaces, giving flat faces and square edges at right angles.
Read the full explanation
It is prepared from rough sawn stock by machining or planing so the section is true and consistent, ready for jointing, framing and general construction without further preparation of the faces. Because the edges are square and the faces flat, PSE timber assembles accurately and takes fixings and joints reliably. Learners should recognise PSE as a prepared, dimensioned timber product, understand that all four surfaces are planed to square, and be able to explain why this suits furniture, framing and joinery where accurate right-angled joints matter.
Your focus
- Define planed square edge (PSE) as timber planed on all four surfaces with square edges.
- Explain why square, flat surfaces support accurate joints, fixings and assembly.
- Justify the use of PSE in furniture, framing and joinery applications.
Performance characteristics of materials Performance characteristics of papers and boards - Performance characteristics of woods exam tips
Marking Points
- Defines PSE as timber planed on all four surfaces, producing flat faces and square edges at right angles.
- Explains that PSE is prepared from rough sawn stock so the section is true and consistent, ready for use.
- Links the square, flat surfaces to accurate assembly, reliable joints and fixings in furniture, framing and joinery.
- Recognises PSE as a prepared, dimensioned timber product rather than rough sawn stock needing further face preparation.
Examiner Tips
- 💡State clearly that all four surfaces are planed to square, since this is the defining feature of PSE.
- 💡Give a concrete use such as furniture frames or joinery to show why square edges aid accurate assembly.
- 💡Contrast PSE with rough sawn stock to demonstrate understanding of preparation and dimensioning.
Common Mistakes
- Describing PSE as planed on only one face and one edge with the rest rough sawn; correct this by stating that PSE is planed on all four surfaces with square edges.
- Treating PSE as rough sawn timber; correct this by explaining it is prepared and dimensioned, ready for jointing and assembly.
- Assuming square edges are cosmetic only; correct this by linking square, flat surfaces to accurate right-angled joints and reliable fixings.